Relief-valve for engines



no Model.)

G. B; TURNER. RELIEF VALVE FOB ENGINES.

Patented Sept. 8, 1885.

Attorney UNITED STATES PATENT ()FFICE.

CHESTER B. TURNER, OF DETROIT, MICHIGAN.

RELIEF-VALVE FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 326,070, dated September'S, 1885.

' Application filed June 4, 1885. (N0 model.)

To (ZZZ whom, it may concern:

Be it known that I, CHESTER B. TURNER, of Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Relief-Valves for Steam-Engines, and I do hereby declare that the fol-' lowing is a full, clear, and exact description thereof, reference being bad to the accompanying drawing, which forms .a part of this specification.

This invention relates to certain new and useful improvements in the construction and operation of relief-valves in the slide-valves of steam-engines, whether such valves have a lap or not.

In all steam-engines liable to have the steam form a compressed cushion against the advance of the piston such compressed steam is apt to offer a great resistance to such advance of the piston, and frequently such resistance is greater than the steampressure on the boiler. When this occurs, it produces a great strain on the engine and a loss of developed power, as so much power is required to overcome such resistance. I provide relief by means of a check valve or valves seated in a passage or passages in the slide-valve, which afl'ord communication between the port or ports leading to the ends of the cylinder of the engine and the steam space outside such valve in the steam-chest.

The invention consists in the peculiar construction, arrangement, and adaptation of parts, as will be more fully hereinafter set forth, and specifically pointed out in the claim.

The figure is a section of a stationary steamengine, showing the stram-chest slide-valve without a lap, and the ports leading from the steam-chest to the ends of the cylinder.

In the accompanying drawing, A represents the steam-chest, B the ports'leading therefrom to the cylinder, and O the slide valve. D is a check-valve located in thecenter of the slide-valve. The moment the compression of steam in the cylinder and in ad Vance of the piston is greater than the boilerpressure in the steam-chest it will open the check-valve and afford immediate relief. The valve D is held between the valve G and a removable cap, 0, secured thereon. This cap limits the action of the valve and prevents it from rubbing against the roof of the steamchest when the valve 0 is moving.

I exhaust from the cylinder by means of independent valves. (Not shown.)

It is obvious that this arrangement is especially adapted for engines where the main valve is used as a cut-off by means of a linkmotion or otherwise.

I am aware of Patent No. 110,490, and do not seek to cover such construction in this application. I

What I claim as my invention is- The combination, with the steamchest A and cylinder having ports B, of the slide-valve 0, having removable cap 0, and the reliefvalve D, operating loosely between said valve and cap, as set forth.

' CHESTER B. TURNER.

Witnesses: V

H. S. SPRAGUE,

CHARLES J HUNT. 

